苏丹Main Unity区块剩余油分布规律及挖潜策略  

REMAINING OIL DISTRIBUTION AND THE DEVELOPMENT STRATEGY OF MAIN UNITY BLOCK IN SUDAN

作　　者：刘洋[1] 沈平平[1,2] 刘春泽[1] 罗旋[3] 

机构地区：[1]中国石油大学,北京102249 [2]中国石油勘探开发研究院 [3]中国石油西南油气田分公司采气工程研究院

出　　处：《西南石油大学学报（自然科学版）》2007年第3期39-42,共4页Journal of Southwest Petroleum University(Science & Technology Edition)

基　　金：中国石油天然气集团公司计划项目(03b60203)。

摘　　要：为了进一步提高研究区水驱采收率,应用Eclipse数值模拟软件,系统地研究了油藏中剩余油的空间分布。结果表明,在不同开发阶段油藏剩余油分布受不同因素的控制,在弹性开发阶段,油藏剩余油主要受储层物性的差异性所控制;在注水开发阶段,储层非均质分布以及井网方式对剩余油分布起到较大的控制作用,该区块目前的剩余油主要分布于渗透率较低的区域、注采井网不完善的油层或油层中的不完善区、注水井非主流线区域。通过井网局部加密、层系调整、注水保持压力可以有效地改善Main Unity油藏的开发效果,但对Main Ghazal这类具有良好物性,连通性好,而且面积不太大的断块油藏,边缘注水开发方式比含油区内部注水开发方式更为优越。提出Main Unity油藏下一步开发调整的优化方案,与现有井网相比可提高采收率4.73%。Study on distribution of remaining oil in target block is conducted by using Eclipse software for improving water flooding efficiency. Results show that distribution of remaining oil is affected by different factors during different development stage, it is affected mainly by difference of formation physical property during expansion driving phase and by formation inhomogeneity and well spacing pattern during water flooding phase. Present remaining oil of this block mainly distributes in the areas with lower permeability, imperfect flooding pattern or blocks in oil layer and non-essential streamline region of injection well. Development effect of Main Unity reservoirs can be effectively improved by locally lowering down well space, adjusting layer system and water flooding pressure maintenance. Development mode of perimeter waterflooding is superior to intracontour waterflooding in dealing with fault block reservoirs like Main Ghazal which has well physical properties, good communication and suitable size. Next stage optimized development plan of Main Unity reservoir is proposed and recovery will be 4.73% higher contrasting to current well spacing pattern.

关 键 词：剩余油 开发阶段 分布规律 优选 挖潜策略 

分 类 号：TE357[石油与天然气工程—油气田开发工程]